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The strength and fracture toughness of small ceramic discs under biaxial flexural load are investigated with two different miniaturized test methods: the small punch test (SPT) and the ball-on-three-balls test (B3B). An alumina ceramic was chosen as sample material. While the specimen geometries are identical for both tests, the experimental set-ups and the stress fields are different. First, the Weibull parameters of strength have been estimated. Second, the fracture toughness is evaluated with an adaption of the surface crack in flexure (SCF) method. The discs are prepared with artificial surface cracks whose sizes have to be measured. The evaluation of stresses and stress intensity factors is based on finite element calculations

Determination of Strength and Fracture Toughness of Small Ceramic Discs Using the Small Punch Test and the Ball-on-three-balls Test